1991 Johnson Evinrude EI 60 Loop V Models 150, 175 outboards Service Manual, Page 64Get this manual
Pulse Limiter Fitting [";1 The pulse limiter fitting for the
l!.J integral valveThe valve is not serviced separately, but must
be clean to allow normal operationA clogged valve might restrict fuel and oil supply, causing serious powerhead damage1Remove the pulse limiter fitting from the crankcase
pulse hose has an
rJl 2Back flush the valve with mild aerosol solvent to remove
any carbon depositsIf excessive carbon deposits are found, the engine must be checked for causes of backfiring before being returned to the customer Incorrect linkage adjustments Incorrect engine temperature Crankcase air leaks Carburetor problems Extended use of flushing attachment3Clean the threaded portion of the fitting and apply OMC Pipe Sealant with Teflon4Install the fitting and secure the pulse limiter with snap clamp